Abstract
The effect of solutionizing time on the age hardening characteristics and the corrosive wear of composites consisting of 6061 and 2014 aluminum alloys reinforced with Al2O3 particles has been investigated. The samples of composites containing 0.1, 0.15 and 0.2 volume fractions of alumina particles (VFAP) and monoliths were solutionized at 540°C for times ranging from 1.5 to 20 hours and quenched in water at room temperature. The time required to get the peak hardness (TPH) during subsequent aging at 160, 180, 200 and 220°C indicates that it decreases with increasing solutionizing time in monoliths while in composites no such systematic variation was observed. The quenched-in vacancies and dislocations generated due to thermal expansion (CTE) effect contribute heavily to the nucleation sites for the precipitates during the aging process. The rotating cylindrical samples when subjected to impact testing or continuous scratching in a given electrolyte show a generation of transient current which increases with the increase in solutionizing time for all the composites. The CTE dislocations serve as preferred anodic site during the corrosive wear process.
Published Version
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